TLK111 datasheet(21/110 Pages) TI1

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TX_CLK

TX_EN

TXD [3:0]

RX_CLK

RX_DV

RX_ER

RXD [3:0]

CRS

COL

PHY

MAC

TX_CLK

TX_EN

TXD [3:0]

RX_CLK

RX_DV

RX_ER

RXD [3:0]

CRS

COL

TLK111

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SLLSEF8B – AUGUST 2013 – REVISED JANUARY 2014

Interfaces

4.1

Media Independent Interface (MII)

The Media Independent Interface (MII) is a synchronous 4-bit wide nibble data interface that connects the

PHY to the MAC in 100B-TX and 10B-T modes. The MII is fully compliant with IEEE802.3-2002 clause 22.

The MII signals are summarized below.

Data signals

TXD [3:0]

RXD [3:0]

Transmit and receive-valid signals

TX_EN

RX_DV

Line-status signals

CRS (carrier sense)

COL (collision)

Figure 4-1 shows the MII-mode signals.

Figure 4-1. MII Signaling

The Isolate bit (BMCR register bit 10), defined in IEEE802.3-2002, electrically isolates the PHY from the

MII (if set, all transactions on the MII interface are ignored by the PHY).

Additionally, the MII interface includes the carrier sense signal CRS, as well as a collision detect signal

COL. The CRS signal asserts to indicate the reception of data from the network or as a function of

transmit data in Half Duplex mode. The COL signal asserts as an indication of a collision which can occur

during half-duplex operation when both transmit and receive operation occur simultaneously.

Interfaces

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